Bring them to the Latin Mass. Frequently. And bring them to pray in front of the neighborhood abortion mill. Often enough. From the time they are very young.
Why? Then they will see the divine at Mass, and the satanic at the abortuary. Enough of the ordinary. This changes a person, before the relative point of no return.
Then send them to the right Catholic college (Christendom College, Thomas Aquinas College, etc.). Let them experience Catholic culture - they do not stand alone. Confirm them in the Faith!
This is yours truly in AD 1981, with mum. Lucky for me, she was street smart. Mum knew how small the devil's playbook was. The Faith was passed on, amidst another very dark era.